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General Knowledge Cluster73 Verified Questions
Human Nervous System GK Questions & Answers
The human nervous system coordinates physiological responses and cognitive operations, divided into the Central Nervous System (CNS), comprising the brain and spinal cord, and the Peripheral Nervous System (PNS). The brain is encased in the cranium and enveloped by three meningeal membranes: the outer dura mater, arachnoid mater, and inner pia mater, cushioned by cerebrospinal fluid (CSF). Anatomically, the brain contains the forebrain (prosencephalon), dominated by the cerebrum for voluntary motor control, sensory integration, and memory; the midbrain (mesencephalon); and the hindbrain (rhombencephalon), consisting of the cerebellum for balance and posture, pons, and medulla oblongata regulating involuntary autonomic functions like respiration and cardiac rhythms. The neuron is the structural and functional unit of neural tissue, composed of a soma (cyton), dendrites, and an axon insulated by Schwann cell-derived myelin sheaths punctuated by Nodes of Ranvier. Signal transmission occurs across synapses via chemical neurotransmitters such as acetylcholine and dopamine. Reflex arcs represent rapid, involuntary neural circuits routed through the spinal cord without requiring prior cerebral processing.
High-yield conceptual summaries for competitive exams and rapid revision.
The Central Nervous System comprises the brain and spinal cord, protected by three meningeal layers (dura, arachnoid, pia mater) and cerebrospinal fluid.
The cerebrum governs sensory interpretation, reasoning, and voluntary action; the cerebellum maintains muscular coordination and equilibrium.
The medulla oblongata in the hindbrain houses vital autonomic centres controlling respiration, cardiovascular reflexes, and gastrointestinal motility.
Neurons transmit electrical action potentials along myelinated axons through saltatory conduction across the Nodes of Ranvier.
Reflex arcs establish monosynaptic or polysynaptic neuronal circuits through the spinal cord for rapid, involuntary motor responses.
Showing 25 Curated Questions73 Total in Bank
1ID: GK-BODY-00529
hardOrgan Systems & Anatomy
Which specific endothelial tight junctions, pericytes, and astrocyte foot processes form the physiological diffusion barrier protecting brain parenchyma from circulating pathogens and macromolecules?
Verified Explanation
The Blood-Brain Barrier (BBB) consists of non-fenestrated brain capillary endothelial cells with claudin-5 and occludin tight junctions, basement membrane, pericytes, and astrocyte end-feet (glial limitans) that tightly control central nervous system molecular transport.
2ID: GK-CURR-00525
hardScience Tech Recent
In January 2024, which neurotechnology company founded by Elon Musk successfully implanted its wireless brain-computer interface (BCI) chip ('Telepathy') into its first human patient?
Verified Explanation
Neuralink performed its first human brain implant under the PRIME study in January 2024, allowing quadriplegic patient Noland Arbaugh to control computer cursors via thought.
3ID: GK-HLTH-00499
mediumAyushman Bharat & National Health Policies
Under the Transplantation of Human Organs and Tissues Act, 1994, how many medical experts comprise the mandatory statutory board of medical experts required to certify brain-stem death for deceased organ donation?
Verified Explanation
Under Section 3(6) of the Transplantation of Human Organs and Tissues Act (THOTA), 1994, brain-stem death must be certified by a board of four medical experts: (1) the registered medical practitioner in charge of the hospital; (2) an independent medical specialist nominated by the hospital head; (3) a neurologist or neurosurgeon nominated from an approved government panel; and (4) the registered medical practitioner treating the deceased patient. Two assessments must be completed at an interval of not less than six hours.
Which medical instrument records the electrical activity and wave patterns (alpha, beta, theta, delta) of the human brain using scalp electrodes?
Verified Explanation
An electroencephalograph (EEG), pioneered by Hans Berger in 1924, records macroscopic electrical oscillations (brain waves) generated by cortical neurons.
Which neurodiagnostic medical instrument records the spontaneous electrical activity and voltage fluctuations of the brain via electrodes placed on the scalp?
Verified Explanation
An electroencephalograph (EEG), first recorded on humans by Hans Berger in 1924, tracks postsynaptic potentials of brain cortical neurons to diagnose epilepsy and sleep disorders.
6ID: GK-BODY-00022
mediumOrgan Systems & Anatomy
Which part of the human brain is primarily responsible for regulating muscle coordination, posture, and motor balance?
Verified Explanation
The cerebellum ('little brain') fine-tunes motor movements and maintains balance using vestibular feedback.
7ID: GK-BODY-00078
easyAnatomy Organ Systems
Which part of the human brain controls vital involuntary autonomic body functions such as heartbeat, breathing, blood pressure, and swallowing?
Verified Explanation
The medulla oblongata connects the brain to the spinal cord, containing cardiac, vasomotor, and respiratory reflex centers.
8ID: GK-BODY-00115
mediumAnatomy Organ Systems
The "Corpus Callosum" is a wide, thick nerve tract in the human brain that performs what essential neurological function?
Verified Explanation
Surgical transection of the corpus callosum (corpus callosotomy) to treat intractable epilepsy led to Roger Sperry's Nobel Prize-winning "Split-Brain" research.
9ID: GK-BODY-00237
mediumOrgan Systems & Anatomy
Which major anatomical structure of the human brain is located dorsal to the brainstem and primarily coordinates voluntary muscular movement, balance, and fine motor posture?
Verified Explanation
The cerebellum ('little brain') processes sensory input and precisely coordinates voluntary motor movements, equilibrium, balance, and procedural motor learning.
10ID: GK-BODY-00271
mediumOrgan Systems & Anatomy
In the human brain, which region located in the posterior cranial fossa coordinates voluntary motor movements, posture, balance, and fine muscle coordination?
Verified Explanation
The cerebellum ("little brain") receives sensory inputs and regulates motor outputs to ensure smooth, precise, and coordinated voluntary movements and equilibrium.
11ID: GK-BODY-00296
hardOrgan Systems & Anatomy
What anatomical arterial structure formed at the base of the brain by the anastomoses of internal carotid and vertebral-basilar arteries provides collateral blood circulation to both cerebral hemispheres?
Verified Explanation
The Circle of Willis is an arterial heptagon at the base of the brain providing crucial collateral circulation between the anterior and posterior cerebral circulations.
12ID: GK-BODY-00348
hardDiseases, Pathology & Immunology
Which autosomal recessive inborn error of metabolism is caused by a deficiency of the hepatic enzyme phenylalanine hydroxylase (PAH), leading to toxic accumulation of phenylalanine in the brain?
Verified Explanation
Phenylketonuria (PKU) is caused by mutations in the PAH gene preventing the conversion of phenylalanine to tyrosine. Elevated blood phenylalanine impairs brain myelin formation, causing profound intellectual disability if not managed by dietary restriction.
13ID: GK-BODY-00557
mediumOrgan Systems & Anatomy
In the human central nervous system, what major brain structure coordinates voluntary motor movement, posture, and balance?
Verified Explanation
The cerebellum ('little brain'), situated beneath the occipital lobes, processes sensory input from the vestibular system and muscles to fine-tune motor activity and equilibrium.
14ID: GK-BODY-00631
hardOrgan Systems & Anatomy
The Blood-Brain Barrier (BBB) is physiologically maintained by non-fenestrated capillary endothelial tight junctions surrounded by the vascular end-feet of which glial cells?
Verified Explanation
Astrocytic end-feet (perivascular feet) ensheath brain microvascular capillaries, inducing and maintaining endothelial tight junctions (composed of claudin-5 and occludin) that form the selective Blood-Brain Barrier.
15ID: GK-BODY-00643
hardOrgan Systems & Anatomy
The Circle of Willis (circulus arteriosus cerebri), a crucial collateral arterial anastomotic ring supplying blood to the cerebral hemispheres, is situated at the base of the brain around the:
Verified Explanation
The Circle of Willis is a polygonal arterial anastomosis located in the interpeduncular cistern at the base of the brain encircling the optic chiasm and pituitary stalk, connecting internal carotid and vertebrobasilar circulations.
16ID: GK-BODY-00008
easyHormones, Enzymes & Nutrition
Which endocrine gland located at the base of the brain is called the 'Master Gland' of the endocrine system?
Verified Explanation
The pituitary gland secretes tropic hormones (TSH, ACTH, GH, LH, FSH) regulating other peripheral endocrine glands.
17ID: GK-BODY-00028
mediumClinical Diagnostics & Tests
What diagnostic recording measures electrical activity of neurons in the cerebral cortex of the brain?
Verified Explanation
Hans Berger developed human EEG in 1924, recording alpha, beta, theta, and delta neural oscillations.
18ID: GK-BODY-00041
hardOrgan Systems & Anatomy
The 'Circle of Willis' is an anastomotic arterial heptagon located in which anatomical region, providing collateral brain perfusion?
Verified Explanation
Thomas Willis described the vascular ring connecting internal carotid and vertebral-basilar arterial systems.
19ID: GK-BODY-00065
easyAnatomy Organ Systems
Which endocrine gland located at the base of the brain is famously called the "Master Gland" because its hormones control other endocrine glands?
Verified Explanation
Under hypothalamus regulation, the pituitary gland secretes trophic hormones (TSH, ACTH, FSH, LH, GH, and Prolactin) controlling body growth and reproduction.
20ID: GK-BODY-00079
easyAnatomy Organ Systems
Which part of the human brain is primarily responsible for motor coordination, balance, equilibrium, and fine muscle movement control?
Verified Explanation
The cerebellum coordinates sensory input to fine-tune motor activity and precision timing, damaged in cerebellar ataxia.
21ID: GK-BODY-00108
mediumVitamins Nutrients
The "Wilson's Disease" is a rare inherited autosomal recessive metabolic disorder characterized by toxic abnormal accumulation of which mineral in the liver, brain, and corneas?
Verified Explanation
Mutations in the ATP7B gene impair biliary copper excretion, causing toxic copper accumulation leading to hepatic cirrhosis and basal ganglia neuropsychiatric symptoms.
22ID: GK-BODY-00131
hardAnatomy Organ Systems
The "Blood-Brain Barrier" (BBB) is a highly selective semipermeable border that protects neural tissue from circulating toxins, formed primarily by which cellular structures?
Verified Explanation
The BBB restricts hydrophilic molecules and large proteins, permitting only lipid-soluble compounds (O2, CO2, alcohol) and specific nutrient transporters (GLUT1 for glucose).
23ID: GK-BODY-00161
easyHormones, Enzymes & Nutrition
Which pea-sized endocrine gland located in the sella turcica at the base of the brain is known as the 'Master Gland' because its tropic hormones control other endocrine glands?
Verified Explanation
The pituitary gland secretes key tropic hormones (TSH, ACTH, FSH, LH, GH, and Prolactin) that regulate the thyroid, adrenal cortex, gonads, and overall body somatic growth.
24ID: GK-BODY-00191
hardOrgan Systems & Anatomy
The 'Circle of Willis' (circulus arteriosus cerebri) is an essential arterial anastomotic polygon providing collateral cerebral circulation at the base of the brain, formed by connections between:
Verified Explanation
The Circle of Willis unites the anterior cerebral circulation (internal carotids via anterior communicating artery) with the posterior circulation (basilar artery via posterior communicating arteries).
25ID: GK-BODY-00211
easyHormones, Enzymes & Nutrition
Which small endocrine gland, located in the sella turcica at the base of the brain, is traditionally termed the 'master gland' of the endocrine system?
Verified Explanation
The pituitary gland secretes trophic hormones (TSH, ACTH, FSH, LH, GH, Prolactin) that control many other peripheral endocrine glands under hypothalamic feedback.
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